12312102105 has 24 divisors (see below), whose sum is σ = 22076875080. Its totient is φ = 6340024320.

The previous prime is 12312102071. The next prime is 12312102107. The reversal of 12312102105 is 50120121321.

It can be written as a sum of positive squares in 4 ways, for example, as 7080921 + 12305021184 = 2661^2 + 110928^2 .

It is not a de Polignac number, because 12312102105 - 2⁸ = 12312101849 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12312102107) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4715976 + ... + 4718585.

It is an arithmetic number, because the mean of its divisors is an integer number (919869795).

Almost surely, 2^12312102105 is an apocalyptic number.

12312102105 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12312102105 is a deficient number, since it is larger than the sum of its proper divisors (9764772975).

12312102105 is a wasteful number, since it uses less digits than its factorization.

12312102105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9434601 (or 9434598 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

Adding to 12312102105 its reverse (50120121321), we get a palindrome (62432223426).

The spelling of 12312102105 in words is "twelve billion, three hundred twelve million, one hundred two thousand, one hundred five".